JS Intl.DateTimeFormat resolvedOptions()

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The Intl.DateTimeFormat.prototype.resolvedOptions() method returns a new object with properties reflecting the locale and date and time formatting options computed during initialization of this DateTimeFormat object.

The source for this interactive example is stored in a GitHub repository. If you’d like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

dateTimeFormat.resolvedOptions()

Return value

A new object with properties reflecting the locale and date and time formatting options computed during the initialization of the given DateTimeFormat object.

Description

The resulting object has the following properties:

locale

The BCP 47 language tag for the locale actually used. If any Unicode extension values were requested in the input BCP 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale.

calendar

E.g. “gregory”

numberingSystem

The values requested using the Unicode extension keys "ca" and "nu" or filled in as default values.

timeZone

The value provided for this property in the options argument; undefined (representing the runtime’s default time zone) if none was provided. Warning: Applications should not rely on undefined being returned, as future versions may return a String value identifying the runtime’s default time zone instead.

hour12

The value provided for this property in the options argument or filled in as a default.

weekday

era

year

month

day

hour

minute

second

timeZoneName

The values resulting from format matching between the corresponding properties in the options argument and the available combinations and representations for date-time formatting in the selected locale. Some of these properties may not be present, indicating that the corresponding components will not be represented in formatted output.

Examples

Using the resolvedOptions method

var germanFakeRegion = new Intl.DateTimeFormat('de-XX', { timeZone: 'UTC' });
var usedOptions = germanFakeRegion.resolvedOptions();

usedOptions.locale;          // "de"
usedOptions.calendar;        // "gregory"
usedOptions.numberingSystem; // "latn"
usedOptions.timeZone;        // "UTC"
usedOptions.month;           // "numeric"

Specifications

Specification Status Comment
[ECMAScript Internationalization API 1.0 (ECMA-402)
The definition of ‘Intl.DateTimeFormat.prototype.resolvedOptions’ in that specification.](https://www.ecma-international.org/ecma-402/1.0/#sec-12.3.3) Standard Initial definition.
[ECMAScript Internationalization API 2.0 (ECMA-402)
The definition of ‘Intl.DateTimeFormat.prototype.resolvedOptions’ in that specification.](https://www.ecma-international.org/ecma-402/2.0/#sec-Intl.DateTimeFormat.prototype.resolvedOptions) Standard  
[ECMAScript Internationalization API 4.0 (ECMA-402)
The definition of ‘Intl.DateTimeFormat.prototype.resolvedOptions’ in that specification.](https://tc39.es/ecma402/#sec-Intl.DateTimeFormat.prototype.resolvedOptions) Draft  

See also


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